Automatic calling device



April 7, 1925.

J. G. BLESSING AUTOMATIC CALLING DEVICE Filed Jan. 21. 1921 Jul-m Efilass m Patented Apr. 7, 1925.

JOHN G. BLESSING, or onrcee rmmors, ASSIGN'OB 'ro anrom'rro'nnno'rmo con-- ?ANY, OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

'lm'romrrc CAILING nnvrcn.

Application filed January 21,1921. Serial No. 488,998.

. To all whom it may conc'em:

an improved Be it known that L lorm G. Bnnssme, a citizen of the United States of America, and a resident of Chicago, Cook County, and State of Illinois, have invented certain new and useful Improvements in Automatic Calling Devices, of which the following is a speclfication.

My invention relates in general to a calling device or impulse transmitter for use in an automatic telephone system of the standard two wire type in which the automatic switches are operated by impulses of current resultant upon the opening and closing of the series l ne circuit at the telephone.

Among the features of my invention are, governor for controlling the speed of the impulses, said overnor having means for disengaging itself from the remainder of the mechanism allowing itself to spin after the desired impulses are sent in and stopping by the friction produced by itself, thereby removing any strain on the governor which would be produced should the governorbe stopped by any mechanical projection placed in the area traversed by it.

Another feature of my invention is the provision of means for increasing the period of time between series of impulses, the long space between the first number hole and the stop increasing the period between digits giving the time effect of a larger number.

It is a well known fact that inthe Strower selector a certain period of time after making vertical movement is necessary to allow the switch to seek an idle trunk and therefore in ordinary dialing the period allowed for the movement is very short when a small number is dialed, for it will be seen that an impulse might belost due to the P fact that the selector might not have com pleted' its rotary motion when the next impulse comes in.

Other detailed features of improvement- Which tend to simplify the construction and improve the operation and general eficiency of the device will be hereinafter pointed out. Fig. 1 of the drawings shows a front view of the calling device with a part of the spring cover cutaway to show the spring.

Fig. 2 is a rear view of the ca ling device showing the governor and cam inter-- rupter.

Fig. 3 is an edgewise view of the calling device, springs and the cam in normal position.

Fig. 4 shows a front view with the fingerhole dial and the number dial removed,

showing the shunt and interrupter showing the gears and other mechanical a part of'the unit gear and match-'- cam' and its driving gear n normal position.

a Fig. 7 is the same as Fig. 6, but showing the elements in their operated position.

Fig. 8 is an edgewise view of the governor I showing the unit gear and ratchet which-is loosely attached thereto;

Fig. 9 is another view of the governor from the side to which the pinion. is attached, showing the combined spring and pawl.

' I will now describe the various parts of the calling device more in detail and explain the operation of the same, reference being made to the various figures of drawings.

My improved callingdevice consists of a mounting plate 11 (see Fig. 3), one side having a raised shoulder 21 (Fig.2) eccentric with the outer edge of the mounting plate and on which are formed two lugs 22 and 23 which serve as means for attaching the device to the base of the telephone and also providing wide surfaces for extend ingthe cam shaft 24 through (Fig.3) and for mounting the interrupter and shunt springs 27, 25 and 26. Another part of the shoulder projects which is concentric with the outer edge of the'plate and has a deression therein, in which the governor rotates (see Fig. 2).

Theopposite side of'plate 11 has a shoulder SOaround its outer surface to form a shallow cup forthe dial 17.

with the outer edge ofthe plate 11 has with- Another depression deeper and eccentric in its area, a raised portion 31. On part 31 v is mounted a plate 32 havingon one side. a shaft 33 (see Fig. 2) extending through the rear of the plate 11 and on the other side 'a stud 34 (Fig. 4) internally threaded to re-' ceive the screw 16. The screw 16 has a. small car projecting to a which as will be seen engage one end of the power sprin 18 and also acts to hold the finger hole dial 38 to i the mounting plate 11. Raised part 31 is also used as a mounting plate for the spring 40.

In another partof the depression of the plate 11 is a shaft on which is loosely mounted the gear and pinion unit 41 and 42. To gear 43 is also mounted in this recessed portion firmly attached the shaft 24 (Fig. 3) projects through the plate 11.

The finger hole dial 38 has on its front a cup 19 for holding the spring 18 and also has a notch out in one side of same for permanently fastening one end of the spring. On the other side of the finger hole dial is a projecting sleeve 44 (Fig. 5) which has loosely mounted thereon the unit ratchet and gear 36 and 35.

A awl 45 is secured to the underside of the fiiiger plate 38 and is held in engagement with theratchet 36 by a spring 46 so that as the dial rotates in one direction the pawl 45 slides over the ratchet 36 and the ratchet and gear remain stationary, but as the dial returns it carries the ratchet and gear with. it.

When the finger hole plate is mounted in place on the stud 34 on the plate 11 the gear teeth 35 operate the gear of the gov-' ernor through the medium of gears 42 and 41 (Figs. 8 and 9) which governor is mounted on the shaft 33 (Fig. 2). On the underside of the finger hole dial and near the edge of same 1s a projecting pin 48 which normally rests against the projecting screw 13 on the finger stop 14 under the tension of the ower spring 18.

T e governor (see Figs. 8 and 9) is loosely mounted on the hollow shaft of the unit gear and ratchet 55, the spring pawl 53 engaging with the teeth of the ratchet 52 so that when the gears operate the governor is rotated also but when the gears come to a stop the governor continues to rotate free from the other operating parts.

As before pointedout the dial is'so arranged that when operated to send the digit 1 for instance, the cam is rotated through 2 complete revolutions and unless some means were rovided to revent it, it will be seen that t e springs 2 would be twice opened and 2 impulses transmitted. However, in Figures 6 and 7 I have shown in detail the mechanism for rendering the last revolution of the cam inefi'ective'to so interrupt springs 27, and for making the cam shaft effective to operate the cam springs 25 and 26. As the dial 38 returns to normal when operated in accordance'with any digit the roller 49 rides up on the lug 50 for a distance equal to that required to revolve the cam once. The cam 60 and the gear43 being slidable endwise will thus be forced to the left as shown in Fig. 6 and while the cam is still revolving 'it will be out of the path originally traversed, and will'therefore not interrupt the spring 27. v This endwise movement of the shaft 24 causes the spring 25 to be moved out of engagement with the spring 26. Also the movement of the lug 50 causes a projection-thereon to be brought into the path of the pins 51 on the gear 41 thus effectually stopping all further movement of the gears.

Thus it will be seen that even though the dial 38 moves through the space equal to an added impulse each time it is operated, yet

this movement is used only to operate the d shunt springs.

IVhat- I claim as my invention is:

1. Ina calling device, a combination of shunt and interrupter springs, a shaft having a cam fixed thereto, and mechanism associated therewith for operating said shaft during one period to directly engage and operate said shunt springs and during another period to alternately open and close said interrupter springs through the medium of said cam.

2. In a calling device, a cam, interrupter springs, mechanism associated therewith having means for rotating said cam twice, and means automatically effective during one of said rotations to move said cam out of range of said springs to permit saidcam to open said springs only once.

3. In a calling device, a rotatable cam, impulse springs normally operated by said cam at each rotation thereof, and mechanism for laterally moving said cam to cause one operation to be omitted Whenever said cam is rotated a plurality of times.

4. In a calling device, a combination of springs, a shaft having a cam fixed thereto, said shaft laterally operated at one time for operating one pair of said springs and rotated at another time for operating another pair of said springs through the medium of said cam.

5. In a calling device, interrupter springs, a cam, and mechanism associated with said device for rotating said cam to interrupt said springs, said mechanism co-operating with said cam to prevent the same from op erating said springs during a certain revolution.

ion

6. In a calling device, an impulse translLil) able during the continued rotation of the dial to prevent its operation of the springs.

9. In a calling device, interrupter springs and shunt springs, a shaft having a cam fixed thereto and moved by the device in one plane to permit said cam to operate said interrupter springs and moved in another plane to operate said shunt springs.

10. In a calling device, interrupter springs, a cam, a finger hole dial for rotating said cam at one time to interrupt said springs, and for rotating the cam at another time in another plane without interrupting said springs.

11. In a calling device, a gear train, impulse sending mechanism controlled thereby, a projection on one of the gears of said.

train, ayfinger dial for operating said gear train, a stop, and means on saiddial for moving said stop into the plane of rotation of said projection to stop said gear train.

12. In a calling device, springs, an end-. Wise movable shaft carrying 'a cam for con trolling said springs, a movable arm for operating said shaft endwise, a gear train for opera-ting said shaft, projections on one of the gears of said train and means for moving said arm into the path of said projec tions to stop said gear train when the arm is operated to move the shaft.

13. In a calling device, shunt and inter rupter springs, a shaft having a cam mounted thereon, said shaft operating to open said shunt springs during one period and operating said lnterrupter sprlngs during another period through the medium of saidcam.

14. In a calling device, a pair of spring combinations, a shaft havinga cam mount ed thereon, a finger hole dial therefor which operates said shaft in one manner to control only one spring combination and which operates said shaft in another manner to control only the other spring combination.

15; In a calling device, a cam, means for rotating said cam any desired number of times, an impulse spring normally operated.

by said cam at e: ch rotation thereof, and means for causing said cam. to miss the spring once and only once out of any plurality of consecutive rotations.

16. In a calling device, a cam, means for roducing consecutive rotations of sai-d cam in groups, .each group comprisin any desired number of rotations, an impu se spring normally operated by said camat each rotation thereof, and means for moving the cam to cause the operation of said spring to be omitted in the case of one rotation, of each 7 Pe I 17. In a calling device, a cam, means for producing consecutive rotations of said cam in groups, each group comprising any desired number of rotations, an impulse spring normally operated by said cam at each rotation thereof, and meansfor moving the cam to cause the operation of sald spring to be omitted in the case of the last rotation of each group. v

18. In a calling device, a cam, means for producing consecutive rotations of said cam in groups, each group comprising any desired number of rotations, impulse springs normally operated by said cam at each rotation thereof, and means operated independent of said springs for causing the cam to miss the spring on the last rotation of each group.

19. In a calling device, a cam, means for producing consecutive rotations of said cam in groups, each group comprising any desired number of rotations, an' impulse spring normally operated by said cam at each rotation thereof, and means for changing the plane of rotation of said cam just one of said'shunt springs when the dial is moved upon initiation of the setting operation to bring said cam into alignment with said impulse springs.

21. Ina calling device, s rings, a shaft carrying an impulse cam, sai shaft movable endwise, a rotatable finger hole dial, a projec-ting member on said dial, an arm engaging said shaft, said member moving said shaft endwise'through the medium of said arm while the cam is rotating to operate said springs.

Signed b me at Chicago, Illinois, this 13th day 0 January, 1921.

K JOHNJG. BLESSING.. 

